Duplicating, manifolding, and the like



D. GE'STET NER DUPLICATING, MANWIFOLDING, AND THE LIKE.

APPLICATION FILED FEB. 26, 1919.

1,426,979 Patented A11 22, 1922.

Works, Tottenham ing, Manifolding,

UNHTEQ IBAVED GESTETNER, 6F ZQNDON, .EBTGLAND.

DUPLICATING, MANIFOLDING. AND THE LIKE,

Specification of Letters Eatent.

Patented Aug. 22, 1i%2.

Application filedFebruary 26, 1919. Serial No. 279,423.

To all whom it may concern:

Be it known that 1, DAVID Gns'rE'rNER, a subject of the Kin of Great Britain and Ireland, and resi ing at Neo-Cyclostyle Hale,London,N. 1?,England, have invented certain new and useful Improvements in and Relating to Duplicatand the like, of which the following is a specification.

T his invention relates to duplicating, manifolding and like methods of reproduction involving the use of stencils produced by the action of light upon compositions of the kind which have their solubility in liquids employed as developers changed by the action of light as for instance, gelat-ine sensitized by means of a bichromate.

@ne object of the invention is to provide an improved sheet for use in the production of stencils.

According to the invention the sheet consists of a sheet of porous material, preferably Yoshino paper, a coating of a composition of the kind specified which is, or is adapted to be, rendered sensitive to light, on said sheet of porous material, and a flexible support, for instance a sheet of suitable paper, adhering to substantially the entire area of other side of the coating.

The sheet with advantage comprises a flexible support perforated or otherwise treated in order that a portion of the flexible support may be conveniently detached in order to provide, a stencil surface, while other portions of the support are left adhering to the sheet in order to provide means whereby the securing of the stencil sheet in the impression-producing device may be conveniently effected. v I

Thus, for instance, the flexible support may be perforated or otherwise suitably treated near one edge of the sheet so that the support may be removed toprovide a stencil surface, while a narrow strip of the support may be left adhering to the stencil sheet near the edge in question.

This strip is conveniently provided with slots or perforations adapted to facilitate securing the sheet in the device employed in producing prints or impresslons from. the stencil; If'desired, the support may beso perforated or otherwise treated that a strip of the support is also left adhering to the opposite edge of the sheet, or it may be perforated so that the support may be removed from the stencil surface and leave strips, of

leaving the maybe asphaltum, which, as is well known,

is rendered insoluble in certain solvents by the action of light.

The invention also consists in the method of producing sheets adapted for use in the production of stencils by coating a flexible support, for instance a. sheet of suitable paper, with a composition of the kind specitied, and applying a sheet of porous material,

preferably Yoshino paper, tosubstantially the entire surface area of the coating.

Prior to applying to the surface of the coating a sheet of porous -material, the coated flexible support may be treated, as hyper forating, to facilitate the removal of the support from the stencil surface while leaving other portions of the support adhering to the sheet to provide means for securing the stencil in the impression-producing device, or otherwise facilitating the manipulation of the stencil. v

In the accompanying drawings, a stencil sheet in accordance with the invention, is illustrated, Figure '1 being an elevation thereof-and Figure 2 a section.

In the drawings, 1 is the sheet of porous material, 2 is the layer of light sensitive composition, and 3 is the flexible support which is perforated at t so that the larger portion of this support, may be removed smaller portion adhering to the light sensitive composition and serving to assist in securing the completed stencil to the duplicating machine ofknown type. I

The invention also extends to the process of producing stencils which comprises ex posing to light a composite sheet comprising a layer of porous material, shino paper,a I position adhering theretp and a. flexible support adhering to the s1de of the layer of light sensitive composition remote from the solvent'liquid either before or after, or both.

before and port.

In developing,

after removing the flexible supa temporary support may be secured to the layer of porous material by means, for instance, of wax so as to facilitate the manipulation of the sheet during development.

Thus, for example, a composite sheet as above described, after exposure, may be immersed in a bath of the developing liquid and at a suitable moment, when for instance the still soluble composition has been washed out of the porous material, a sheet of paper provided with a coating of wax may be ap plied to the porous material, the stencil sheet turned over in the developer and the flexible support stripped off and the development completed. a

On withdrawing the stencil sheet from the developing liquid the temporary support may be removed at once or later on.

It is considered desirable, and in some cases essential, to expose the stencil sheet with the layer of porous material directed to the light.

When however a transparent or relatively transparent flexible support is used, exposure in this manner need not be effected when the light prints are produced from originals on which the image is constituted by lines or dots, that is to say, for instance in producing stencils'from' line drawings or engravings, manuscript or printing or positives or negatives produced by the half tone process.

In producing prints or impressions according to theinvention, the stencil pros duced in the manner described may be introduced after treatment if desired with a softening agent, for instance, glycerine if a gelatinous composition is employed in forming the stencil, into a duplicating device of known character and the usual procedure followed for producing the prints or impressions. p

The prints or impressions may be pro duced as described in the British specifications Nos. 8648, 8649, 8651 of 24th May, 1918, and No. 8952 of 30th May, 1918,. thus. for instance, the stencils may be arranged over a supporting surface between which and the stencil sheet a substantial layer of ink is interposed, and the prints or impressions may be obtained by applying the impression receiving surfaces to the surface of the stencil when thus supported. Inthis case, by the employment of suitable inks, prints or impressions resembling those produced by the employment of engraved plates may be produce It is also to be understood that the present invention comprises the combination of the it seems details and features set forth in the aforesaid specifica'tlon with the features hereinbefore set forth in so far as the details and features in question may be combined with the present invention.

In conclusion, it may be pointed out that the invention dispenses with the transfer of a pellicle of gelatine or other composition from a supporting sheet on which it has been exposed to light to a temporary support, and then to afinal support formed of porous material in order that it may be employed as a stencil. and as .a result the process of producing stencils by the action of light is considerably simplified and otherwise improved. During the whole pocess of producing and using a stencil, according to the invention, the,pellicle of gelatine is secured to the porous final support and so far as other supporting means are made use of, in carrying the invention into effect, they are employed as means for facilitating the manipulation of the porous final support with its coating in situ or facilitating the manufacture of stencil sheets.

Having nowdescribed my invention, what I claim as new and desire to secure by Letters Patent is p 1. An improved sheet for 'use .in the production of stencils by the action of light. upon a light sensitive composition consisting of a sheet of of a composition of the kind specified on the porous material, and a sheet of flexible supporting material in adhesive connection with substantially the entire surface area of the I other side-of the said coating.

2. An improved sheet for use in the pro position of the kind specified on the Yoshino' paper, and a sheet of flexible supporting material in adhesive connection with substantially the entire surface area of the other side of the said coating.

4. The method of producing sheets adapted for use in the production of stencils, which comprises coating a flexible support, with a porous material, a coating light sensitive composition of the kind specified, and causing a sheet of porous mate rial to be in adhesive connection with substantially the entire surface area of the coating. In testimony whereof I have signed my name to this specification. I

DA'VID GESTETNER. 

